JP6990483B2 - Jig grinding machine with upward exhaust / heat exhaust structure - Google Patents

Description

The present invention relates to a jig grinding machine , and more particularly to a heat exhaust structure for exhaust heat thereof.

Among machine tools that perform metal processing, jig grinding machines are relatively good, for example, as described in Patent Document 1, provided with a mechanism for moving a grindstone rotating motor holding a grindstone at high acceleration. It is possible to efficiently generate an accurate contour with a smooth finished surface. Further, for example, in the apparatus described in Non-Patent Document 1, in circular hole drilling, the grindstone shaft motor is rotated, and the grindstone shaft itself is held and rotated in an eccentric state, and further, in that state. It has a mechanism that makes it possible to reciprocate the mechanism itself in the direction of the rotation axis while maintaining the above. In these machine tools, for example, the heat generated by the grindstone shaft motor is discharged in all directions by the compressed air supplied from the external fixing device through the rotary union (rotary joint), and the processing heat is also combined with the upper part. It was discharged from the open part.

Japanese Unexamined Patent Publication No. 9-155676

Shinji Shimizu; "Machine Machines Learned from the Beginning", p. 53 Okawa Publishing; "Tool Engineer" April 2016, p. 51

As described in Non-Patent Document 1 above, the conventional jig grinding machine covers the periphery of the grindstone as a workpiece and a tool, thereby preventing chips and rupturing the grindstone. .. On the other hand, in recent machines, as described in Non-Patent Document 2, the entire processing chamber is covered to isolate the worker from not only the grindstone but also the moving part. However, due to this added sealing structure, the waste heat of the grindstone shaft motor described above tends to stay in the enclosed chamber. The heat once accumulated in the processing chamber raises the temperature of the table and the workpiece, causing deformation due to heat. The problem is that this significantly impairs the accuracy of the machining results. Normally, for a motor for rotating a tool of a machine tool, it is standard to circulate air, oil or water and exhaust heat to the outside. The increase in cost due to the addition is irresistible.

The present invention has been made in such a background, and an object of the present invention is to provide a jig grinding machine having a structure capable of removing heat relatively easily.

In order to achieve the above object, as a result of various studies, the present inventor has a structure in which a ventilation fan is provided on the upper part of the head to supply air from the table side and suck it upward, and a dust collecting duct is provided. We have found a structure that extends close to the grindstone shaft motor, sucks out air from the motor in all directions, and prevents the exhaust from hitting the table as much as possible.

That is, the jig grinding machine of the present invention has a processing chamber including at least a head, a table, and a grinding shaft motor inside, and a cover covering the processing chamber is provided, and the cover corresponds to both sides of the head. Exhaust holes are provided at the respective positions, and the exhaust ducts are connected to the exhaust ducts from positions corresponding to both sides of the head to suck out air that becomes hot due to the heat generated by the grinding machine shaft motor and is directed in all directions. The first upward exhaust configuration, which extends downward to the vicinity of the grinding machine motor to generate high temperature due to the heat generated by the grinding machine motor and exhausts air in all directions upward, and substantially below the table on the side surface of the cover. A second upward direction in which air near the table, including air flowing in from the slit, is exhausted upward toward the ventilation fan by providing a slit at a corresponding position and providing a ventilation fan on the upper part of the head on the top surface of the cover. A jig grinding machine equipped with an exhaust configuration, further, a line for supplying compressed air for cooling is added to the processing chamber, and the supplied compressed air affects the thermal deformation of the mechanical device in the processing chamber. It is characterized in that the temperature is adjusted so as not to give .
As described above , in the present invention, in order to suck up the air upward , a ventilation fan is provided on the upper part of the head and the air is exhausted upward .
Motors for moving a complicated movable mechanism may be arranged near the suction of the ventilation fan provided on the upper part of the head so that the exhaust heat of them does not go downward. If necessary, add a plate to control the direction so that the air toward the ventilation fan hits the motors well.

According to the present invention, in the case of the machine described in Non-Patent Document 2, the displacement in the Y direction (depth direction) for 8 hours operation can be suppressed to less than half depending on the operating conditions.

It is a figure which shows the whole structure of the jig grinding machine as a machine tool which concerns on 1st Embodiment of this invention. It is a figure which shows mainly the head part of the jig grinding machine as the machine tool which concerns on 1st Embodiment of this invention. It is a figure which shows the cover which covers a processing chamber, and the heat retention state in the cover in the jig grinding machine which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the direction of air flow in the jig grinding machine to which the air blow device as the machine tool which concerns on 1st Embodiment of this invention is attached. It is a figure which shows the structure of the main part of the jig grinding machine to which the air blow device as a machine tool which concerns on 1st Embodiment of this invention is attached, extends a duct for dust collection close to a grindstone shaft motor, and goes from a motor in all directions. Breathe out the air. It is a figure which shows the structure of the main part of the jig grinding machine which concerns on the 2nd Embodiment of this invention, and shows the example of providing the cover slit so that the air flow around a table tends upward. It is a figure which shows the structure of the main part of the jig grinding machine which concerns on 3rd Embodiment of this invention, and shows the example which provided the fan in the upper part of a head, and sucks up from the gap of the sheet metal of a column and a head. It is a figure which shows the structure of the main part of the jig grinding machine which concerns on 4th Embodiment of this invention, and shows the example which the line of compressed air for cooling is added.

FIG. 1 is a diagram showing a configuration of a main part of a jig grinding machine as a machine tool according to the first embodiment of the present invention, and FIG. 2 is a diagram mainly showing a head portion thereof. Although not shown in FIGS. 1 and 2, it goes without saying that the jig grinding machine according to the present embodiment has general mechanical parts such as a bed and a column 80 (see FIGS. 3, 5 to 8). .. As shown in FIG. 1, the jig grinding machine according to the present embodiment moves up and down with respect to a work (not shown) placed on the table 120 while rotating the grindstone 102 provided at the tip of the head 100. Jig grinding is performed on the work by applying various machining operations via the drive device 104, the rotary drive device 106, the cutting device 108, and the like.

To describe the operation of the head 100 in detail, as shown in FIGS. 1 and 2, in the jig grinding machine according to the present embodiment, the vertical drive device 104 is a rotatable quill 110 via the vertical motion transmission device 104A. Drive up and down. Further, the rotation drive device 106 rotationally drives the quill 110 and the notch device 108 at the lower part of the head 100 via the rotation transmission device 106A. Further, the cutting device 108 cuts the grindstone 102 together with the grindstone rotation motor 102A into the work. Wiring is supplied via the slip ring 104B in order to supply power and signals to the grindstone motor and the cutting device 108 provided under the quill. Further, the quill 110 attached to the tip end side thereof can be rotated (revolved) by the rotation drive device 106 and the rotation transmission device 106A described above via the rotation transmission device 106A and the vertical motion transmission device 104A. Compressed air and lubricant are supplied via the rotary union 101. The grindstone rotation motor 102A attached to the notch portion 108A of the notch device 108 is composed of, for example, a high-frequency motor, and when the grindstone rotation motor 102A rotates, the grindstone 102 attached with the motor shaft as the grindstone shaft. Can rotate (rotate) the grindstone.

Here, as shown in FIGS. 1 and 2, the vertical drive device 104 includes a drive device such as a ball screw or a linear motor (not shown), and moves the head 100 in a vertical linear direction along the Z axis. Giving a function. Further, the rotation drive device 106 provides a function of rotating the grindstone 102 and the grindstone rotation motor 102A on the lower side of the figure together with the cutting device 108 along the C axis (rotation axis). That is, the structure is such that rotational motion (C-axis) and reciprocating motion (Z-axis) can be performed simultaneously without interfering with each other. Further, the cutting device 108 is also arranged so as to be able to perform a linear motion along a direction (U axis) orthogonal to the vertical drive (Z axis), which also does not interfere with the above two motions. Then, a rotary motion (rotation) can be given to the grindstone 102 separately from these motions. Then, as shown in FIG. 1, by combining a table 120 capable of mounting a work separately from the head 100 and driving it in the XY directions and a driving device thereof (not shown), jig grinding can be performed on the work described above. .. Further, it is provided with a W axis capable of moving the entire head 100 up and down with respect to a column or the like (not shown). Therefore, the W axis is parallel to the Z axis. The jig grinding machine according to the present embodiment is provided with the above coordinate axes and can perform the above operations.

Here, as shown in FIG. 2, an air tube 202 extending from the upper part of the head 100 is connected in the conduit, and this air is air passage in the quill 110 as shown by a thick broken line in FIG. (Not shown) flows and is exhausted as cooling air in the vicinity of the grindstone rotation motor 102A. That is, it is a structure that supplies cooling air with a center-through structure. For example, cooling air is supplied through a common supply hole formed by communicating the spindle component and the shaft center portion of both the quill 110 (tool tool). Will be done. As a result, cooling air can be supplied from the center through the center of the tool with a relatively simple structure, and cooling air is blown near the quill 110 (tool tool) to be used as coolant air against heat generated by the drive parts. Can be done. As the drive component, heat generation is large mainly due to the drive of the vertical drive device 104, the rotary drive device 106, or the grindstone rotary motor 102A. It should be noted that not only the coolant air is supplied against the heat generated by the driving parts, but also, although not shown, the coolant as the lubricating oil against the heat generated by the cutting of the work (not shown) by the grindstone 102 can be injected. ..

FIG. 3 is a diagram showing a cover covering a processing chamber and a heat retention state inside the cover in the jig grinding machine according to the first embodiment of the present invention. As shown in FIG. 3, in the jig grinding machine according to the present embodiment, a cover 302 is provided so as to cover the processing chamber 300. Therefore, the heat generated by driving the vertical drive device 104 (see FIGS. 1 and 2), the rotary drive device 106 (see FIGS. 1 and 2), or the grindstone rotary motor 102A is as shown by a thick arrow in FIG. It may stay inside the cover 302. Although only one of the covers 302 can be seen in FIG. 3, exhaust holes 304 are provided on both sides of the head 100, respectively. However, it is difficult to effectively exhaust the hot air only by providing these exhaust holes 304.

FIG. 4 is a diagram for explaining a direction in which air flows in a jig grinding machine to which an air blow device is attached as a machine tool according to the present embodiment. That is, as shown in FIG. 4, an air blow device 402 is attached to the jig grinding machine according to the present embodiment in addition to the cooling air described above. From this air blow device 402, air can be mainly blown around the work W and the grindstone 102 as a tool to remove chips and residual coolant (lubricating oil).

FIG. 5 is a diagram showing a configuration of a main part of a jig grinding machine to which an air blow device (not shown in FIG. 5) is attached as a machine tool according to the present embodiment. That is, in the jig grinding machine according to the present embodiment, the dust collecting duct (exhaust duct) 502 is extended to the vicinity of the grindstone shaft motor 102A, and air directed in all directions is sucked out from the grindstone shaft motor 102A. That is, in the jig grinding machine according to the present embodiment, as shown in FIG. 5, dust collecting ducts (exhaust ducts) 502 connected to the respective exhaust holes 304 shown in FIG. 3 are provided from both sides of the head 100. Therefore, these dust collecting ducts (exhaust ducts) 502 are extended to the vicinity of the grindstone shaft motor 102A so that air directed in all directions is sucked out from the grindstone shaft motor 102A. The grindstone shaft motor 102A is a high-frequency motor and generates a large amount of heat because it rotates at high speed with high output. By allowing the duct (exhaust duct) 502 to suck out as shown by the arrow in FIG. 5, effective exhaust heat can be achieved.

FIG. 6 is a diagram showing a configuration of a main part of a jig grinding machine according to a second embodiment of the present invention. That is, in the jig grinding machine according to the second embodiment of the present invention, the dust collecting duct (exhaust duct) 502 is extended to the vicinity of the grindstone shaft motor 102A, as in the first embodiment described above, and the grindstone shaft motor 102A As shown in FIG. 6, a slit 302A is provided in the cover 302 covering the processing chamber 300 so that the air flow around the table 120 tends to be upward in addition to the configuration in which the air is sucked out in all directions. As described above, in order to extend the dust collecting duct (exhaust duct) 502 to the vicinity of the grindstone shaft motor 102A and suck out air in all directions from the grindstone shaft motor 102A, in the processing chamber 300 in the cover 302, the vicinity of the lower portion is negative. It tends to be pressure. Therefore, by providing the slit 302A in the cover 302, air flows into the processing chamber 300 from the outside of the cover 302 through the slit 302A, and the flow of the air around the table 120 can be made to tend to be upward. can. As a result, more effective heat exhaust can be achieved as compared with the case where the cover 302 is not provided with the slit 302A.

FIG. 7 is a diagram showing a configuration of a main part of a jig grinding machine according to a third embodiment of the present invention. That is, in the jig grinding machine according to the third embodiment of the present invention, in addition to having the same configuration as the first and second embodiments described above, a ventilation fan (fan) 702 is provided on the upper part of the head 100. The stagnant air is sucked up from the gap between the sheet metal of the column 80 and the head 100. That is, in the jig grinder according to the third embodiment of the present invention, the dust collecting duct (exhaust duct) 502 is extended close to the grindstone shaft motor 102A, and the air is sucked out from the grindstone shaft motor 102A in all directions. In addition to the effect of preventing the exhaust from hitting the table 120 as much as possible by providing the slit 302A in the cover 320 covering the 300, the presence of the dust collecting duct (exhaust duct) 502 and the slit 302A allows air to flow from the table 120 side. A ventilation fan (fan) 702 is provided on the upper part of the head 100 in order to supply the air and suck the air upward so as to exhaust the air upward. As a result, as shown by the arrow on the side of the head 100 and the column 80 and the arrow on the upper side of the column 80, the stagnant air can be sucked up from the gap between the sheet metal of the column 80 and the head 100, which is even more effective. It is possible to exhaust heat.

FIG. 8 is a diagram showing a configuration of a main part of a jig grinding machine according to a fourth embodiment of the present invention. That is, in the jig grinding machine according to the third embodiment described above, since the ventilation fan (fan) 702 is provided on the upper part of the head 100, the inside of the head 100 becomes a negative pressure and the temperature of the parts inside the head 100 rises. There is a concern that it may end up. In order to prevent the temperature of the parts inside the head 100 from rising due to excessive negative pressure inside the head 100, the jig grinding machine according to the fourth embodiment of the present invention is machined as necessary. Compressed air is supplied to the chamber 300. That is, in the jig grinding machine according to the fourth embodiment, in addition to the configuration in which the ventilation fan (fan) 702 of the third embodiment described above is provided, as shown in FIG. 8, the compressed air line 802 for cooling is provided. It is desirable that the temperature of the supplied compressed air is adjusted so as not to affect the thermal deformation of the machine.

80 columns, 100 heads, 101 rotary union, 102 grindstone,
102A grindstone shaft motor, 104 vertical drive device, 104A vertical motion transmission device,
104B slip ring, 106 rotation drive, 106A rotation transmission,
108 notch, 108A notch, 110 quill,
120 table, 202 air tube, 300 processing room, 302 cover,
302A slit, 304 exhaust hole, 402 air blower,
502 Dust collection duct (exhaust duct), 702 ventilation fan (fan),
802 Compressed air line for cooling, W work

Claims (1)

It has a processing chamber containing at least a head, a table, and a grinding machine shaft motor inside, and is provided with a cover covering the processing chamber. The cover is provided with exhaust holes at positions corresponding to both sides of the head. From the positions where the exhaust ducts connected to the exhaust holes correspond to both sides of the head, the exhaust ducts are extended downward to the vicinity of the grinding machine shaft motor in order to suck out air that becomes hot due to the heat generated by the grinding machine shaft motor and is provided in all directions. As a result, the first upward exhaust configuration in which the temperature rises due to the heat generated by the grinding machine shaft motor and the air heading in all directions is exhausted upward, and a slit is provided at a position corresponding to substantially the lower side of the table on the side surface of the cover, and the cover is provided. A jig grinding machine having a second upward exhaust configuration in which air near the table, including air flowing in from the slit, is exhausted upward toward the ventilation fan by providing a ventilation fan on the top surface of the head. Further, a line for supplying compressed air for cooling is added to the processing chamber, and the temperature of the supplied compressed air is adjusted so as not to affect the thermal deformation of the mechanical device in the processing chamber. A jig grinding machine characterized by that.

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